Resilient composition for printers&#39; rollers.



TE ES PATENT @FIBIEGE.

CHARLES EMILE SOHN, OF LONDON, ENGLAND, ASSIGNOB. 0F ONE-HALF T0 "USHER-WALKER, LIMITED, OF LONDON, ENGLAND.

. RESILIENT COMPOSITION FOR PRINTERS ROLLERS.

No Drawing.

To all whom it may concern:

Be it known that I, CHARLES EMILE SoHN, a subject of the King ofEngland, residing at London, in England, have invented cer tain new anduseful Improvements in Resilient Compositions for Printers Rollers, ofwhich the following is a specification.

This invention is for improvements in resilient compositions forprinters rollers.

It is well-known to make printers rollers from gelatinous compositions,such as mixtures of soaked glue and glycerin, but if in use thesecompositions are subjected to a high temperature they are apt tobecomedistorted or partly fused and sometimes they burst. It has alsobeen proposed to render such compositions insoluble by the action offormaldehyde and other chemical agents, but hitherto such treatmentshave been subject to serious disadvantages; treatment with formaldehydefor example causing the gelatinous mixture to set very rapidly andgreatly diminishing the strength of the resulting material.

It is known to prepare elastic compositions by treating colloids such asJapan glue dissolved in glycerin so as to form a semifluid mass, withsalicylic acid, tannin, lysoform and a small percentage ofhexamethylene-tetramin. Compositions prepared in such manner are verysoft and possess a permanent elasticity and on account of theseproperties they have been employed as filling materials for hollowtires.

The object of the present invention is the preparation from gelatinouscompositions of a material for printers rollers, the composition beingtreated in such a way as to impart thereto the property of infusibilitywhile giving the material ample time to set so that the operation ofmolding can be conveniently carried out, the treatment being such as notto weaken the resulting composition in any way. 7

According to this invention a process of producing an infusibleresilient composition for printers rollers consists in mixing andmelting up together soaked glue and glycerin, introducing a concentratedaqueous solution of hexamethylene-tetramin in about the proportion ofbetween 2% and 1% upon the glue-glycerin mixture, and running themixture into molds of the desired shape which are kept hot for sometime.

Specification of Letters Patent.

Patented lFeb. is, not a.

Application filed December 23, 1914. Serial No. 878,800.

The following is a description of one method of carrying this inventioninto effect.

Glue is soaked in water until it has absorbed the desired amount when itisthen allowed to stand until flexible according to the usual practice.The soaked glue is mixed with glycerin in the usual proportions andthese are melted up together, say in a steam heated copper. There isthen introduced into the mixture a concentrated aqueous solution ofhexamethylene-tetramin. The proportion of hexamethylene-tetramin mayconveniently be between 2% and 1% of the composition. Thus for example 1lb. of hexamethylene-tetramin may be dissolved in water and added to 400lbs. of the glueglycerin mixture.

The whole is mechanically stirred and run out as quickly as possibleinto molds of the desired shape. The molds are kept hot for some timesay two hours, the length of time depending upon the proportions of theingredients used, the alkalinity or acidity and other circumstances.

A simple preliminary test is suficient to decide which proportionsaremost advantageous and also the temperature and duration of theoperations.

The advantages of this process are that ample time is afi'orded for themanipulation of the composition before it sets. The re- .sultingmaterial has the property of infusibility and yet the strength of thecomposition is not in any way diminished.

What I claim as my invention and desire to secure by Letters Patentis 1. The herein described process for the production of an infusibleresilient composition for printers rollers, which consists in soakingglue in water until the desired amount has been absorbed, allowing thesoaked glue to stand until it is flexible, mixing the soaked glue withglycerin and melting up the mixture, introducing into the mixture aconcentrated aqueous solution of hexamethylene-tetramin in about theproportion of between two-tenths per cent. and one per cent. of theglue-glycerin mixture, stirring the mixture thus produced, running itquickly into molds of the desired shape, and keeping the said molds hotfor some time after the mixture has been run into t em. Y

@ Lemme v 2. The herein described infusible resilient In. testimonywhereof I have signed my composition of matter for printers rollers,name to this specification in the presence of consisting of soaked glueand glycerin and two subscribing Witnesses.

hexamethylene-tetramin, the quantity of CHARLES EMILE SOHN. 5hexamethylene-tetramin being between two- \Vitnesses:

tenths per cent. and one per cent. of the HARRY D. ZEn),

glue-glycerin mixture. ALFRED JAMES Gowme.

